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I have a hybrid GPU, with a discrete Radeon HD 8xxM series card, and the built in Intel card. If I use the AMD Catalyst control centre to disable the dgpu, then

sudo lshw -C VIDEO
   description: VGA compatible controller
   product: Haswell-ULT Integrated Graphics Controller
   vendor: Intel Corporation
   physical id: 2
   bus info: pci@0000:00:02.0
   version: 09
   width: 64 bits
   clock: 33MHz
   capabilities: msi pm vga_controller bus_master cap_list rom
   configuration: driver=i915 latency=0
   resources: irq:59 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:5000(size=64)

So I just see the one integrated card as expected, and it appears to be driven by the i915 module. But

lsmod | grep fglrx
fglrx                6728820  0 
amd_iommu_v2           19198  1 fglrx

So fglrx is still loaded?

Does fglrx control both the dgpu and igpu somehow? and yet the i915 is still needed also to drive the intel built-in card too?

If I can switch in catalyst control centre, does that mean my system is "muxed"?

If I turn back on the dgpu mode in catalyst, does this exclusivley use the high performance card, or is it "dyanmic", switching when needed?

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